The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ISOBUTYL
Definition of ISOBUTYL
noun
The univalent hydrocarbon radical derived from isobutanol
Wiktionary · CC BY-SA
Where it comes from
From isobut(anol) + -yl.
Etymology via Wiktionary (CC BY-SA).
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
ISOBUTYL in OUTLIER
Players have found it on 6 boards so far. 11 players have found it across Outlier's history.
It first turned up on Day 71, 30 July 2026. The most recent board was Day 110, 7 September 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 71, 30 July 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
ISOBUTYL starts with I and ends with L. Sorted, its letters read BILOSTUY - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start ISOBUT
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found ISOBUTYL?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 71 - and most players walked straight past it.
Play today's OUTLIER